最近做的一个项目中，有这样一个要求，在浏览器中调用系统的拍照功能或者选择文件，然后将文件上传到服务器，类似修改头像。 简单而言，就是在一个html页面中有这样一段代码 <input class="filePrew" type="file" capture="camera" accept="image/*" name="image">
刚开始的时候，没有感觉很难的，因为在UC浏览器、系统自带的浏览器中都可以进行拍照/文件管理器选择，可是在自己所写的Activity中却不行。后来实在是没有思路了，就在网上找了一下，发现要 实现这种功能，都是在webview的WebChromeClient中覆盖掉openFileChooser方法，注意openFileChooser方法在WebChromeClient中有@hide标记。这里只管重写即可,下面将主要代码贴出来，做个记录
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private ValueCallback<Uri> mUploadFile;
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private static final int REQUEST_UPLOAD_FILE_CODE = 12343;
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private void setWebChromeClient()
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{
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if (null != mMainWebView)
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{
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mMainWebView.setWebChromeClient(new WebChromeClient()
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{
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public void openFileChooser(ValueCallback<Uri> uploadFile, String acceptType, String capture)
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{
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openFileChooser(uploadFile);
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}
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public void openFileChooser(ValueCallback<Uri> uploadFile, String acceptType)
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{
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openFileChooser(uploadFile);
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}
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public void openFileChooser(ValueCallback<Uri> uploadFile)
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{
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mUploadFile = uploadFile;
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startActivityForResult(Intent.createChooser(createCameraIntent(), "Image Browser"), REQUEST_UPLOAD_FILE_CODE);
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}
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});
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}
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}
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private Intent createCameraIntent()
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{
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Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
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Intent imageIntent = new Intent(Intent.ACTION_GET_CONTENT);
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imageIntent.setType("image/*");
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return cameraIntent;
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}
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protected void onActivityResult(int requestCode, int resultCode, Intent data)
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{
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if (requestCode == REQUEST_UPLOAD_FILE_CODE && resultCode == RESULT_OK)
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{
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if (null == mUploadFile)
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{
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return;
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}
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Uri result = (null == data) ? null : data.getData();
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if (null != result)
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{
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ContentResolver resolver = this.getContentResolver();
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String[] columns = { MediaStore.Images.Media.DATA };
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Cursor cursor = resolver.query(result, columns, null, null, null);
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cursor.moveToFirst();
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int columnIndex = cursor.getColumnIndex(columns[0]);
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String imgPath = cursor.getString(columnIndex);
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System.out.println("imgPath = " + imgPath);
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if (null == imgPath)
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{
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return;
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}
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File file = new File(imgPath);
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result = Uri.fromFile(handleFile(file));
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mUploadFile.onReceiveValue(result);
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mUploadFile = null;
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}
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}
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super.onActivityResult(requestCode, resultCode, data);
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}
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/**处理拍照/选择的文件*/
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private File handleFile(File file)
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{
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DisplayMetrics dMetrics = getResources().getDisplayMetrics();
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BitmapFactory.Options options = new Options();
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options.inJustDecodeBounds = true;
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BitmapFactory.decodeFile(file.getAbsolutePath(), options);
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int imageWidth = options.outWidth;
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int imageHeight = options.outHeight;
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System.out.println(" imageWidth = " + imageWidth + " imageHeight = " + imageHeight);
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int widthSample = (int) (imageWidth / (dMetrics.density * 90));
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int heightSample = (int) (imageHeight / (dMetrics.density * 90));
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System.out.println("widthSample = " + widthSample + " heightSample = " + heightSample);
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options.inSampleSize = widthSample < heightSample ? heightSample : widthSample;
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options.inJustDecodeBounds = false;
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Bitmap newBitmap = BitmapFactory.decodeFile(file.getAbsolutePath(), options);
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System.out.println("newBitmap.size = " + newBitmap.getRowBytes() * newBitmap.getHeight());
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File handleFile = new File(file.getParentFile(), "upload.png");
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try
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{
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if (newBitmap.compress(CompressFormat.PNG, 50, new FileOutputStream(handleFile)))
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{
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System.out.println("保存图片成功");
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}
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}
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catch (FileNotFoundException e)
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{
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e.printStackTrace();
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}
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return handleFile;
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}
这样就可以在WebView中上传文件了。记得要添加相应的权限！ 参考：http://developer.android.com/about/versions/android-3.0.html
http://blog.sina.com.cn/s/blog_5749ead90101clrn.html
